/Engine/Source/Editor/ViewportInteraction/Public/ViewportWorldInteraction.h
Pairs to interactors by setting the other interactor for each interactor
void PairInteractors ( [UViewportInteractor](API\Editor\ViewportInteraction\UViewportInteractor) * FirstInteractor, [UViewportInteractor](API\Editor\ViewportInteraction\UViewportInteractor) * SecondInteractor )